its ubiquitous
gaming
That despite being a relatively "closed" compared to Linux and other open source, you can still do pretty much anything you want.Having said that, and without starting a big flame war im not a fan of this new direction MS is taking me, trying to force things down my throat and the full screen apps really annoy me, if they continue down this path im not sure if I will continue to use windows.

I hate the OSx layout, how apps open and minimise, also the responsiveness is slow, whereas on my PC with a SSD everything feels very fast and snappy.
Could be a placebo effect.

Better for business users. I've used OS X for the last 2 years and I've recently gone back to windows. It's been quite nice to be back to windows again, I feel it's more efficient for the business user.

Because it does everything I need it to do consistently and reliably. Runs everything, extremely stable, no farting around to get the thing working. I prefer BSD or Linux for my servers, but when it comes to the desktop, Windows does it best for me. Games are a small factor, mostly the applications and development tools, although the desktop itself "just works" too. I'm constantly toying with the various alternatives, I've yet to find one that actually compels me to switch.. I frequently find myself missing various Windows programs/features while in Linux, but not the other way around. As far as OSX goes, have it, can appreciate what it is, just don't care for it.. it's not my thing.

12+ years which has made me knowledgeable of the OS and software. It would take a lot to adapt to a new OS, and even then, I would be stuck between two worlds since I don't see myself completely abandoning Windows for a long time.

P.S. I'm still running Windows 7 and I have no plans to ever upgrade to Windows 8.